cOssel is an iteration of Johann's Kossel. Design intents are equip a dual head end effector and to move the linear rails to an open design. It also uses 20x20 instead of 15x15. All other tweaks are minor. This design otherwise entirely copies Johann's delta-bot intent. Default configuration is setup for Dual Extruders, heated bed, and EE fan.
cOssel attempts to enable a low-power, non-contact autoleveling sensor as an alternative to using a retractable mechanical switch as used in other Rostock/Kossel deltas. This feature is still experimental as most IR sensors have not been proven repeatable, thus is still unfit for use. Video: Infrared Leveling
The assembly process should take a short weekend to complete. Make sure that you have a standard tool set, including ball-end metric allen keys.
Main Vertical Assembly
- Cossel base side 8.JPG
- Cossel slider 1
- Cossel slider 2
- Cossel slider 3
- Cossel ee top.JPG
- Cossel probe 1.JPG
- Cossel probe2.JPG
The following images show the terminal block on the board. I ended up removing the terminal blocks from the boards to reduce interference from the carriage assembly as it approached the Z_MAX home position.
- Cossel estops 3.JPG
End stops 3
It is assumed that your push rods have already been cut to size by yourself or a vendor. If not, cut your rods to length.
- Place the rod end ball standing vertically on a stable surface.
- Place the rod end socket loosely over the ball end ball.
- Space a pair of needle nose pliers around the perimeter of the socket.
- Press firmly down and click the socket over the ball.
- Prepare the epoxy solution.
- Apply dab of mixed epoxy onto threaded 4mm dia, 20mm long set screw
- Thread set screw into rod end as deep as it will go
- Apply another dab of epoxy onto the set screws, this time, more generous
- Gently place the set screws into the carbon fiber tube.
- Firmly press both opposing rod ends together along the tube axis.
- Set rod to try. Ensure that rod ends are parallel with each other.
Frame - External
The RAMPS_1.4 board does not by default have sufficient IO to power three heaters and additional fans for the extruder heaters. Products exist already to serve this need, but I decided to build my own. I added a constant 12V drop for a always-on stepper driver cooling fan (so long as PS-ON is on), and a PWM circuit for a single extruder cooling fan. I shall use only one fan for both extruders.
This page is acting as a placeholder until more content gets developed. Stay tuned.